[clang-tools-extra] [NFC] Fix uninitialized scalar field in constructor. (PR #118324)

[Zahira Ammarguellat via cfe-commits]

zahiraam wrote:

@HighCommander4 Is that good as a change? Do you still want an issue to be opened?
@tahonermann can you please review? Thanks.

https://github.com/llvm/llvm-project/pull/118324